code: def setUp(self):
      self.rng = np.random.RandomState(0)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import test_util
  from tensorflow.python.framework import constant_op
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import histogram_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 1 for calling the HistogramFixedWidthTest obj's underlying member method code with example usage: obj.setUp() without return types